Two Co(ii) complexes containing pyridylbenzimidazole ligands as chemosensors for the sensing of levofloxacin, acetylacetone, and Ni²⁺with high selectivity and sensitivity

Abstract

Based on the organic ligand 1,1′-(1,6-hexanediyl)bis[2-(2-pyridyl)benzimidazole], two new Co(ii)-based complexes were successfully synthesized hydrothermally, and they are promising sensors for detecting acac, LEV, and Ni2+ ions.

Fluorescent Eu3+/Tb3+ Metal–Organic Frameworks for Ratiometric Temperature Sensing Regulated by Ligand Energy

“… These characteristic emissions related with Eu 3+ and Tb 3+ are similar to those from single-center Eu-L and Tb-L MOFs. Eu 0.0143 Tb 0.9857 -OBA also displays an emission at 340 nm assigned to the intraligand π-to-π* orbital transition . This hints that the excited energy from OBA 2– does not transfer to Tb 3+ or Eu 3+ as effectively as from BPNDC 2– and BDC 2– .…”

“…Eu 0.0143 Tb 0.9857 -OBA also displays an emission at 340 nm assigned to the intraligand π-toπ* orbital transition. 18 This hints that the excited energy from OBA 2− does not transfer to Tb 3+ or Eu 3+ as effectively as from BPNDC 2− and BDC 2− . The quantum yields for Eu 0.0143 Tb 0.9857 -L are 45.3%, 29.3%, and 60.65%.…”

A Zn(II) Coordination Polymer for Fluorescent Turn-Off Selective Sensing of Heavy Metal Cation and Toxic Inorganic Anions

“…Nowadays, coordination polymers (CPs), as one class of promising functional materials, have received widespread attention not only due to unique topologies, such as multiple active sites, modifiable channels and fascinating architectures, but also due to excellent performance and potential applications in various fields, such as catalyst carrier, proton conducting, sensing, magnetic and fluorescent materials, gas separation and storage [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 ]. In particular, the structural diversity and multi-functional characteristics of CPs aroused intense interest in the design and construction of chemical sensing materials [ 9 , 10 , 11 , 12 ]. It has been well documented that due to their fast response, high sensitivity and naked eye monitoring, fluorescent CPs can be one type of good chemical sensor for detecting analytes through fluorescence quenching, enhancement or shift [ 13 , 14 , 15 , 16 ].…”

“…In particular, the structural diversity and multi-functional characteristics of CPs aroused intense interest in the design and construction of chemical sensing materials [9][10][11][12]. It has been well documented that due to their fast response, high sensitivity and naked eye monitoring, fluorescent CPs can be one type of good chemical sensor for detecting analytes through fluorescence quenching, enhancement or shift [13][14][15][16].…”

Fast, Selective and Sensitive Fluorescence Detection of Levofloxacin, Fe3+ and Cu2+ Ions in 100% Aqueous Solution Via Their Reciprocal Recognition

“…So far, a number of protocols have been reported for the fabrication of advanced electrochemical sensor materials (Table 2, entries 1-6) such as carbon-based materials, nanomaterials, metal-organic frameworks (MOFs), conductive polymer-based composites and surface-active agents [37][38][39][40][41][42]. On the other hand, to provide efficient fluorescence sensors (Table 2, entries 7-12) metal ion based coordination polymers (CPs) or MOFs have also been explored [43][44][45][46][47][48]. However, these expensive materials often possess low chemical stability and sensitivity against moisture and their fabrication also requires multistep syntheses.…”